Art. 1009.04 Soil An unstable and suitable or restricted-use soil shall meet the above criteria, but the moisture content exceeds the maximum defined in Article 205.06. If there are changed or differing site conditions according to Article 105.01, an absence or sparsity of geotechnical data, or for other reasons; an unstable and suitable or restricted-use soil may be declared unsuitable by the Engineer. Restricted-use miscellaneous materials shall include stones and boulders naturally occurring within the right-of-way; broken concrete without protruding metal bars; bricks; rock; stone; recycled asphalt pavement according to Article 1031.01 with no expansive aggregate; uncontaminated dirt and sand generated from construction or demolition activities; and other materials proposed by the Contractor and approved by the Engineer. Other excavated material not described above shall be designated as unsuitable by the Engineer. At the discretion of the Engineer, soils that exhibit potential for significant erosion or excessive volume change may also be designated as unsuitable. SECTION 1010. FINELY DIVIDED MINERALS
1010.01 Description. Finely divided minerals shall include fly ash, microsilica
(silica fume), high-reactivity metakaolin (HRM), and ground granulated blast-furnace slag (GGBF). The finely divided minerals will be approved according to the Bureau of Materials Policy Memorandum, "Acceptance Procedure for Finely Divided Minerals used in Concrete and Other Applications". The Department will maintain a qualified producer list. Different sources or types of finely divided minerals shall not be mixed or used alternately in the same item of construction, unless approved by the Engineer.
1010.02 Fly Ash. Fly ash shall consist of the finely divided residue that results
from the combustion of ground or powdered coal, transported from the combustion chamber by exhaust gas, collected by mechanical or electrical means, and stored in stockpiles or bins. Fly ash shall be according to AASHTO M 295 and the following.
a.Reserved.
b.Portland Cement Concrete, Cement Aggregate Mixture II, Fabric Formed Concrete Revetment Mat Grout, and Insertion Lining of Pipe Culverts Grout. The fly ash shall be Class C or F.
c.Soil Modification. The fly ash shall be Class C.
1010.03 Microsilica (silica fume). Microsilica is an amorphous silica of high
silica content and purity possessing high pozzolanic activity. The microsilica used in portland cement concrete shall be according to AASHTO M 307. The microsilica shall be supplied either in a dry, densified form or as a water- based slurry. Lime Art. 1012.02
1010.04 High-Reactivity Metakaolin (HRM). High-reactivity metakaolin
(HRM) is a reactive aluminosilicate pozzolan formed by calcining purified kaolinate at a specific temperature range. The HRM used in portland cement concrete shall be according to AASHTO M 321, except the fineness shall be a maximum 15 percent retained on the No. 325 (45 µm) sieve. The HRM shall be supplied in a dry, undensified form.
1010.05 Ground Granulated Blast-Furnace (GGBF) Slag. Ground
granulated blast-furnace (GGBF) slag shall consist of the glassy granular material formed when molten blast-furnace slag is rapidly chilled and then finely ground. The GGBF slag used in portland cement concrete shall be according to AASHTO M 302, for Grade 100 or Grade 120 material. SECTION 1011. MINERAL FILLER
1011.01 Description. Mineral filler shall consist of dry limestone dust, fly ash,
cement kiln dust, or lime kiln dust; and shall be according to the following.
a.Gradation. The gradation shall be according to the following. Sieve Percent Passing No. 30 (600 µm) 100 No. 100 (150 µm) 92±8 No. 200 (75 µm) 82±18
b.Loss on Ignition. The loss on ignition for all products shall be a maximum of five percent when tested according to the ITP, "Loss on Ignition for Mineral Filler".
c.Additional requirements for SMA. Mineral filler for use in SMA shall be free from organic impurities and have a Plasticity Index 4. SECTION 1012. LIME
1012.01 Hydrated Lime. Hydrated lime shall be according to ASTM C 207.
When used in soil modification, lime stabilized soil mixture, and hot-mix asphalt (HMA), the hydrated lime shall be according to ASTM C 207, Type N.
1012.02 By-Product, Hydrated Lime for Soil Modification. By-product,
hydrated lime (hydrator tailings) shall be according to the following.
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Source: Illinois Standard Specifications for Road and Bridge Construction, 2022 Edition. Pages 831–832 of 1,217. View official source ↗